Jack



E. E. THOMSON.

Mex.

APPLICATION FILED DEC- |919.

1,359,849. Pand Nov. 23,1920.

2 SHEETS-SHEET 1.

lll'llllll'llllllll IF INVENTOR. P BY Enosl''. Tmon.

A TTORNE Y.

VE. E. THOMSON.

JACK.

APPLICATION HLED 0126.1. |919.

Patented N ov. 23, 1920.

2 SHEETS-SHEET 2 IVENTOR. BYEnosTwmsm.

ATTORNEY.

UNITED STATES PATENT OFFICE.

ENOS E. THOMSON, F CLEVELAND, OHIO.

JACK.

Specification ot L'etters Patent.

Patented Nov. 23, 1920.

` To all whom 'it may concern Be it known that I, Enos E. TnoMsoN,residing at Cleveland, in the county of Cuyaho a and State oflOho, haveinvented new an useful Improvements in Jacks, ofwhich the following is aspecification.

This invention relates to jacks, and comprehends a construction, bymeans of which a load may be lifted twice as high and twice as fast aswith an ordinary jack, and with the expenditure of a minimum of energy.

The nature and advantages of the invention will be better understoodwhen the following detail description is taken in conne@ tion with theaccompanying drawings, the invention residing in the construction,combination and arrangement of parts as claimed.

In the drawings forming part of this specification, like numerals ofreference indicate similar parts in the several views and wherein Figure1 is a side elevation of the jack constructed in accordance with myinvention.

Fig. 2 is a transverse Sectional View taken on the line 2-2 of Fig. 1.

Fig. 3 is a top plan view.

Fig. 4 is a transverse sectional view taken on the line 4 4 of Fig. 1.

Fig. 5 is a vertical sectional `view taken through the jack.

The jack constructed in accordance with m invention comprises a base10,'from wli'ich rises a plurality of hollow tubular Standards. Thesestandards include a central standard 11 whose diameter eatly exceeds thediameter of the standard;v 12. The standard 11 is interiorly threaded toaccommodate an exteriorly threaded sleeve 13 which is provided with abevel gear 14 at the up r end thereof. The lifting screw 15 is s idablethrough the sleeve and has a relatively large end portion 16. This screwis supported by means of the transverse member 17 of a frame whichincludes parallel depending rods 18 which are telescopically tted withinthe tubular members 19, which latter are slidabl fitted within thetubular members 12. A evel gear 20 oppositely disposed with regard tothe bevel gear 14 is threadedly associated with the screw 15 for thepurpose to be hereinafter described.

A plate of substantially U-shaped formation 1n plan is indicated at 21and is terminally connected with the tubular members 19. This plateconstitutes a bearing for thc shaft 22 upon which is fixed the inion orbevel gear 23 which is positionet between Hthe gears 14 and 20respectively to operati` these gears. The shaft 22 is of the extensioncrank t pe embodying universal joints 24 so that t 1e user of the jackmay stand in an u right position while raisingr or lowering t e jack asthe occasion may require. The tubular standards 11 and 12 respectivelyareconnected at their upper ends by means of the plate 25 which servesto brace the construction, and also serves as a seat for the bevel gear14 of the hollow sleeve 13. In ractice, the crank extension 26 of thesha. t 22 is actuated to o crate the gear 23, which in turn operatestlle gears 14 and 20 in reverse directions. The ear 14 rotates thesleeve 13 within the tu ular standard 11 thereby elevating the sleeve,while the gear 20 slides the screw 15 upwardly through the sleeve 13approximately twice as fast as the speed with which the sleeve 13 iselevated. It is therefore obvious that the jack will elevate a loadtwice the distance and twice as fast as the jack of Ordinar constructionand that the construction an arrangement is such that all ratchets andcatches are eliminated. When the jack is not in use, the crank extensioncan be folded against the jacks so as to provide an article which can beconveniently carried in a tool box or the like. The tubular members 19and the rods 18 telescope one within the other, while the members 19telescope within the standards 12 when the jack is being raised orlowered as will be understood.

While it is believed that from the foregoing description that the natureand ad-` vantages of the invention will be readily apparent, I desire tohave it understood that I do not limit myself in this connection, inthat such changes ma be resorted to when desired as fall wit in thescope of what is claimed.

Having thus described my invention what I claim as new is 1. A jackcomprising a base, a hollow tubular standard rising therefrom, andinteriorly threaded, an exteriorly threaded sleeve operable within saidstandard, a bevel gear secured to the u per end of said sleeve, alifting screw slidab e through said sleeve, a bevel lgear havingthreaded association with sai screw, means for rotating said l gears inreverse direction whereby the sleeve is elevated within the standard andthe screw lit'ted with "respect to said sleeve, means for supportingsaid screw.

2. A jack comprising a base, a hollow tubular standard rising therefromand interiorly threaded, spaced hollow standards rising from said base,an eateriorljr threaded sleeve operable within said threaded stainlard,and a bevel gear carried by the upper end of said sleeve, a liftingserew slidabie through said sleeve, a bevel gear threaded v associatedwithin said screw, a frame supporting said screw` and including parallelmembers slidably titted within said spaced tubular standards, and meansfor rotating said gears in a reverse direction whereby the sleeve isrotated to elevate the screw with relation to the sleeve.

3. A jaek comprising a base, an enlarged tubular standard risingtherefrom and interiorly threaded, spaced hollow tubular standardsrising from'the base at opposite sides of the enlarged standard, asleeve exteriorly threaded and operable within the enlarged standards,and a bevel gear carried by the upper end of said sleeve, a bevel gearhaving threaded association with said lifting serew, hollow tubularmembers teleseopically fitted within the standardsI at the oppositesides of the enlarged standard, a plate connecting said tubular member,said plate constituting a bearing. a shaft jonrnaled in said. bearing. abevel gear carried by the shaft and arranged to operate theaforementioned gears in reverse direction, whereby the sleeve iselevated within the tubular member upon rotation` and the lifting serewelevated with respect to the Sleeve, a frame supporting said sei-ew. andsaid t'rame ineluding parallel rods teleseopieall)Y fitted within saidtubular member.

ln testimony whereof I affix my signature.

ENOS E. THOMSON,

